Optimizing Alkali-Concentration on Fresh and Durability Properties of Defected Sanitary Ware Porcelain based Geopolymer Concrete

Introducing defective sanitaryware porcelain as a low-calcium binder for geopolymer mix concrete was regarded as green concrete. Four alkali concentrations (۸M, ۱۰M, ۱۲M, and ۱۴M) mixes involving four initial curing temperatures (۶۰°C, ۷۵°C, ۹۰°C, and ۱۰۵°C) were investigated for porosity, rapid chloride penetration, compressive and abrasive resistance. Tests on geopolymer paste for consistency and initial and final setting times were also assessed. For all the mixes, consistency and setting time decreased with increased alkali concentration levels. An increment in curing temperature increased the setting time rate. Microstructural studies such as X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were carried out, and the results were presented. The compressive and abrasive resistance of the specimen performance increased with an increase in the initial curing temperature and alkali concentration level. Majorly, the mechanical strength of porcelain-based geopolymer specimens increased by increasing the alkali concentration level. Applying ۱۰۵°C for the initial curing temperature to the specimen, compressive strength, abrasive resistance, and resistibility to chloride ingress of the specimen enhanced. At the ۲۸-days curing period, the ultimate compressive strength was ۶۸.۰۳ N/mm۲, the lowest weight loss from abrasive motion was ۰.۰۹%, and the lowest passing charge was ۱,۴۴۰.۹۱ coulombs were recorded respectively. As a result, porcelain-based geopolymers required a high initial curing temperature and a high alkali concentration level. It was found that ۱۴M porcelain-based specimens heated at ۱۰۵°C curing temperature for ۲۴ hours led to an eco-friendly concrete mix with prominent positive results for engineering properties. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۴-۰۱۰-۰۴-۰۵ Full Text: PDF

کلیدواژه ها:

Geopolymers ، Rapid Chloride Penetration ، Porosity ، Porcelain ، Abrasive Resistance.